Finding the Fourth Proportional to 1,064.39, 1,468.61 and 644.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,064.39 : 1,468.61 = 644.73 : x
2. Step 2: Convert to fraction form
   1,064.39/1,468.61 = 644.73/x
3. Step 3: Cross multiply
   1,064.39x = 1,468.61 × 644.73
4. Step 4: Simplify right side
   1,064.39x = 946,856.93
5. Step 5: Solve for x
   x = 946,856.93/1,064.39
6. Step 6: Final answer
   x = 889.58